DEVICE AND METHOD FOR CARRYING OUT MULTICHANNEL ACOUSTIC ECHO CANCELLATION WITH A VARIABLE NUMBER OF CHANNELS

摘要

The present invention relates to a device and method for carrying out acoustic echo cancellation (2) when playing back C-channel audio signals on a D-channel audio signal transmission system with CD. This invention can be used, for example, in videoconferencing, in which a variable number of active speakers are spatially played back according to the seating positions thereof. The aim of the invention is to solve for the poor convergence of the adaptive echo cancellation when the loudspeaker signals are strongly correlated. The invention provides that in addition to the known method of subjecting audio signals to preprocessing (V1,..., VD), which preferably induces a decorrelation, C output signals of the preprocessing units are selected by a channel combining device (5) and distributed to the loudspeakers (L1,..., LD), several signals being played back on a number of loudspeakers. Said aim is achieved by the reduction of the channels from D to C and by virtue of the fact that only the C signals are subjected to an adaptive matching.